Switch



C. E. TREAT SWITCH Filed May 31. 1922 Nov. 6 1923.

Patented Nov. 6, i923..

UNHT@ CLIFFORD E. TREAT, 0F LOS ANGELES, CALIFORNIA..

SWTTCH.

Application led May 31, 1922. Serial No. 564,809.

To all whom t may concern:

Be it known that lf, CLIFFORD E. TREAT, a citizen of the United States, and a resident of the city of Los ngeles, county of Los Angeles, and State of California, have invented certain new and useful Improvements in Switches, of which the following is a specification.

This invention relates to electric switches and particularly to electric switches than can be readily embodied in an electrical attachment plug. j

An important object of my invention is to provide a switch that is small and compact in character. Y

Another object of my invention is to provide a switch exceptionally positive in ac-V tion. The switch in my invention is held firmly in place either in the open or closed position. This is an important feature of my invention, especially when the switch is combined in an attachment plug. Such attachment plugs receive considerable rough handling.

Another object of my invention is to provide a switch which does not require a coiled spring to impart resistance to the opening or closing of the switch to maintain the movable contact in its proper position.

Another object of my invention'is to provide an electrical attachment plug with a switch, the members of which can be easily mounted and held in position independent of the containing case.

The accompanying drawings illustrate the invention:

Figure 1 is a side elevation of a switch constructed in accordance with the provisions of this invention. The switch in this instance being embodied in an electrically equipped attachment plug.

Fig. 2 is a side elevation of Fig. 1 with half the case removed to show the' construction of the switch.

Fig. 3 is a side elevation of half the case.

Fig. 4 is an edge elevation of Fig. 2 sectioned along the irregular line aat-x4'.

Fig. 5 is an edge elevation of Fig. 2 sectioned along the line m5--m Fig. 6 is an edge elevation of Fig. l2 sectioned along the irregular line @0G-m6- Fig. 7 is an elevation of the switch mechanism with theswitch open. Y

Fig. 8 is an elevation of the switch mechanism with the switch closed.

Referring to the drawings, there is protension on the spring 6.

vided a suitable case in this instance substantially in duplicate halves or sections 1.

The longitudinal edge walls 2 of the case are provided with openings 3 to accommodatean operating member 4. The ends 5 of the operating member 4 are circular in cross section and composed of insulating material. The intermediate portion 6 of the operating member 4 is composed of spring metal. The spring metal is bent near the center to form a loop or projecting surface 7. A guide member 8 holds the operating member 4 in place by means of guides 9. Tn this case the guide member 8 contains also a pin 10 which holds a pivotally mounted contact member l1 and a roller 12. The pin 10 is so placed on the guide member 8 that the pivotally mounted contact member 11 and roller 12 are engaged by the projecting surface 7 of the operating member 4.

Figs. 7 and 8 illustrate the action of the switch mechanism. l/Vhen the switch is either open or closed, there is little or no The operating member 4 is held stationary by the contact of the projecting surface 7 with the roller 12 on one side and the pivotally mounted contact member 11 on the other. The Contact memberll is held in position by the contact of one of its edges 13 against the spring 6. When the operating member 4 is moved the projecting surface 7 of the operating member 4 is pushed down by the roller 12 andv the spring 6 is pushed down against the guides 9. The spring 6 of the operating member 4 yields to permit the projecting surface 7 to pass under the roller 12.` (Fig. 7.) A resistance is imparted thereby to the operation of the switch. This resistance is equally encountered whether the switch is being opened or closed. The pivotally mounted contact member 11 is operated to open or close the switch by the action of the projecting sur-face 7 of the operating member 4 engaging in a notch '24 formed in the pivotally mounted contact member 11.

The guide member 8 to which the pivotally mounted contact member 11 and rollel` 12 are loosely fastened by the pin 10 and which holds the operating member 4 by the guides 9 is fastened on an insulating mountingl member 14. On the mounting member 14 is fastened a stationary contact member 15. The stationary contact member 15 is provided with a screw 16 for connection with the electric supply and for binding the Contact member 15 to the mounting member 14. The contact faces 17 of the contact memberl 15 are sprung together vwhen the switch is open (Fig. 7). TheY pivotally mounted contact member 11 is wedged between the faces 17 of t-he stationary contact member 15 when the switch is closed. The wedging of the pivotallyi-mounted contact member 11 between the faces 17 of the stationary contact-member 15V yinsures excellent contact between the faces 17 and the pivotally mounted contact member 11. The guiding memberS in this case holds a pin 18 by which the plug receptacle 19 is connected.

The parts above mentioned constitute the switch proper. In this particular embodiment of the invention, I have provided a second terminal in the form of a plug receptacle 20, a duplicate of the plug receptacle 19. Connectedv with the plug receptacle 20 is providedv a clip 21 containing a binding screw 22, whereby an electric cord 23 is attached to .the clip 21.

It is clear from the` foregoing thatthe construction above described provides a plug receptacle which may .readily be attached to an electric heating or cooking device and that the electric current may be readily opened or closed by means of the operating member 41. lVhile the parti-cular construction illustrated'in the foregoing description and acco-mpanying drawings is well suited to the purposes of my invention, it is to be understood that such construction has been set forth as one example only of a practical embodiment of my invention. My invention is not limited to the single embodiment above mentioned but is of the scope set forth in the following claims.

. I claim:

V1. In a switch the combination of an operating member comprised of a spring having a projecting surface, a guide member limiting said operating member to a relatively `reciprocating motion, and a roller spaced Vto engage 'said projecting surface to placeV tension on said operating member when reciprocated to openv or close the switch.

2. In a switch the combination of an operating member comprised of a spring having a projecting surface, a guide member limiting said operating member to a relatively reciprocating motion, a roller spaced to engage said projecting surface to place tensionv on said'operating member when reciprocated to open'or close the switch, a stationary contact member, and a pivotally `mounted .contact member adapted to releasably: en-x gage said stationary contact member by the'A reciprocating action of said projecting surface. l i

3. In a switch'the combination of an operating member comprised of a spring having a projecting surface, a guide member limiting said operating member to a relatively Vreciprocating motion, ya roller spaced to engage said projecting surface to place tension on said operating member' when reciprocated to open or close the switch, a stationary contact` member, a p-ivotally mounted contact member adapted to releasably engage said stationary contact member byv-the reciproeating action of lsaid projecting surface, an insulating mountin member holding in spaced relation the a |oresaid members of the switch.

1. Ina switch equipped attachment plug,

the combination of a case,l a reciprocating i 'operating member comprised of a spring having a projecting surface, a guide member limiting said operating memberto relatively reciprocating motion, a. roller spaced to engage said projecting surface to place tension on said operating member when reciprocated to open or close the switch.

5. In a switch equipped attachment plug,

thecombination of a case, an operating member comprised of a spring having a projecting surface, a guide member to hold said operating member to a relatively lreciprocating motion, a roller placed to engage said projecting surface to provide a tensio-n on said operating member when reciproca-ted vto close the switch, a stationary Contact member, a pivotally mounted 'contact member adapted to releasab-lyV engage the first contact member upon reciprocation of said o-perating member. c

Signed. at Los Angeles, California, this 17th day of May, 1922.Vv I l' y Y Y y CLIFFORD E. TREAT. Witnesses c y RICHARD F. LY0N, n j KATE MOKEE. 1 l 

